IS 3761: Metal Side Racks (Adjustable Type) - Specification

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IS 3761 (1983) : Metal Side Racks (Adjustable Type) -
Specification [CED 35: Furniture]

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PROTECTED BY COPYRIGHT

18 t a761 -ISB3

( Reaffirmed 2005 )

Indian Standard

SPECIFICATION FOR
METAL SIDE RACKS (ADJUSTABLE TYPE )

( First Revision )

UDC 684'464044

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INDIAN STANDAFDS INRTITUTIOlH

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IS : 3761 - 1983

Indian Standard

SPECIFICATION FOR
METAL SIDE RACKS ( ADJUSTABLE TYPE )

(First Revision )

Furniture Sectional Committee, BDC 35

Chairman

Shri a. Bharadwaj
207, Golf Links, New Delbi

Members Representing

Shri A, M. Chaki Calcutta Cabinet Makers* and Furnishers'

Association, Calcutta
Shri R. S. Duooal Engineer-in-Chief *s Branch, Army Headquarters

New Delhi
Shri S. C. Garg ( Alternate )
Shri 1. P. Figueredo Godrej & Boyce Manufacturing Co Ltd, Bombay

Shri H. H, Jamshedji ( Alternate )
Shri T. N. Gupta Central Building Research Institute ( CSIR )

Roorkee
Shri V. K. Agqarwal ( Alternate )
Shri D, B. Jain Directorate General of Supplies and Disposals

New Delhi
Shri O. D- Sanger ( Alternate )
Dr M. L. Mehta Ministry of Education & Social Welfare, New

Delhi
Shri P. N. Mathur ( Alternate )
Shrx J. A. Panchal National Institute of Design, Ahmadabad

Shri H. K, Vyas ( Alternate )
Shri Ashok C. Patbl Chandan Metal Products Pvt Ltd, Vadodara

Shri Arun C. Patel ( Alternate )
Shri P. Rajagopalan Indian Institute of Architects, Bombay

Representative Small Industries Service Institute, New Delhi

Shri S. N. Sanyal Forest Research Institute and Colleges, Dehra

Dun
Shri M. B. Saxena Central Public Works Department, New Delhi

Architect ( NZ ) yiU ( Alternate )
Col G. B. Singh The Indian Plywood Manufacturing Co Ltd, New

Delhi
Dr a, Purushotham ( Alternate )

( Continued on page 2 )
(C) Copyright 1984
INDIAN STANDARDS INSTITUTION

This publication is protected under the Indian Copyright Act ( XIV of 1957 ) and
reproduction in whole or in part by any means except with written permission of the
publisher shall be deemed to be an infringement of copyright under the said Act.

IS : 3761 - 1983

( Continued from page 1 )

Members Representing

Shri p. B. Sheth Ahmedabad Eagle Engineering Enterprises Pvt

Ltd, Ahmadabad
Shri B. L. Sheth ( Alternate )
Shri L. G. Toye Research, Design and Standards Organization

( Ministry of Railways ), Lucknow
Shri V. K. Punj ( Alternate )
Shri N. Venkataraman The Western India Plywoods Ltd, Distt

Cannanore ( Kerala )
Shri N. E. Govindan ( Alternate )
Shri G. Raman, Director General, ISI ( Ex-officio Member )

Director ( Civ Engg )

Secretary

Shri A. K. Avasthy
Assistant Director ( Civ Engg ), ISi

Metal Furniture Subcommittee, BDC 35 : 1

Convener
Shri J. A. Panchal National lastitute of Desiga, Ahnsadabad

Members

Shri H. K. Vyas ( Alternate to
Shri J. A. Panchal)
Shri J, K. Aggarwal Engincer-in-Chief's Branch, Army Headquarters,

New Delhi
Shri M. N. Khullar ( Alternate )
Shri V. K. Agrav^al Hindustan Aluminium Corporation Ltd, Bombay

Shri Atma Ram Behki The Small Scale Steel Furniture Manufacturers*

Association ( Regd ), New Delhi
Shri Shiv Kumar Kapahi ( Alternate )
Shri I. P. Figueredo Godrej & Boyce Manufacturing Co Pvt Ltd,

Bombay
Shri H. H. Jamshedji ( Alternate )
Shri Gopal Ramnarayan Featherlitc Corporation, Bangalore

Shri Baldev Ramnarayan ( Alternate )
Shri D. B. Jain Directorate General of Supplies and Disposals,

New Delhi
Joint Director of Industries The Director of Industries and Commerce,

AND Commerce ( RP ) ( Government of Tamil Nadu ), Madras

Deputy Director of Industries
AND Commerce ( L C ) ( Alternate )
Shri Ashok C. Patel Chandan Metal Products Pvt Ltd, Vadodara

Shri Arun C. Patel ( Alternate )

IS : 3761 - 1983

Indian Standard

SPECIFICATION FOR
METAL SIDE RACKS ( ADJUSTABLE TYPE )

( First Revision J

0. FOREWORD

0.1 This Indian Standard ( First Revision ) was adopted by the Indian
Standards Institution on 30 December 1983, after the draft finalized by
the Furniture Sectional Committee had been approved by the Civil
Engineering Division Council.

0.2 Sheet metal furniture is being made in the country for over a number
of years. However, the sizes, finish and function of furniture items as
made by various manufacturers require to be co-ordinated. This standard
was, therefore, first prepared in 1966 to rationalize the sizes and to specify
the finishes consistent with corrosion protection. In this revision the
grade of materials to be used in the components have been incorporated.

0.3 This standard contains clauses which require the purchaser to supply
certain technical information at the time of placing order ( see 8 ).

0.4 In the formulation of this standard due weightage has been given to
international co-ordination among the standards and practices prevaiUng
in different countries in addition to relating it to the practices in the field
in this country.

0.5 For the purpose of deciding whether a particular requirement of this
standard is complied with, the final value, observed or calculated, expres-
shig the result of a test or analysis, shall be rounded off in accordanpe
with IS : 2 - 1960*. The nurtlber of significant places retained in the
rounded off value should be the same as that of the specified value in this
standard.

1. SCOPE

1.1 This standard lays down the requirements for metal side raeks,'

*Rule& for rounding oflf numerical valuqs ( revHed ),

IS : 3761 - 1983

2. MATERIALS

2.1 Mild Steel Sheet — Mild steel sheet shall confoTtn to giade of
IS : 1079-1973* or grade of IS : 513-1973t.

2.2 Mild Steel Angle — Mild steel for hot rolled angle section shall
conform to IS : 226-1975J. Hot rolled mild steel angles shall conform to
IS : 808-1964§, Angle sections may also be cold formed from strip steel
conforming to grade of IS : 4030-197311.

2.3 Bolts — The bolts used for assembly of side racks shall be M6 ( 6 mm
in diameter ) and the thickness of the square nut shall be 6 mm.

2.4 Wood Particle Boards — Wood particle boards shall conform to type
FPTHof IS: 3087-1965l[.

2.5 Veneered Particle Boards — Veneered particle boards shall conforn^
to type EX SO GP of IS : 3097-1980**.

2.6 Blockhoards — Blockboards shall conform to Grade 2 of
IS :1659-1979tt.

2.7 Plywood — Plywood shall conform to grade BWR and type BB of
IS : 303-1975tt

3. DIMENSIONS AND TOLERANCES

3.1 Dimensions — The overall dimensions of side racks shall be as below:
Height 710 mm or height of table

Width 900 mm

Depth 375 mm

3.1.1 The side racks shall have three shelves; the top shelf shall be flush
with the top of the angle posts s|,nd, therefore, the first hole shall be
appropriately located. The bottom shelf shall be fixed at the second hole
from the bottom.

♦Specification fdr hot rolled carbon steel sheet atid strip ( third revision ).
tSpeciflcation for cold rolled carbon steel sheets ( setond revision ).
^Specification for structural ^teel { $taiidafd quality ) (fifth revision ).
^Specification for rolled ste^l bedm, chatinei atid angle seetiotiS {first revision ).
llSpecificatlon for cold rolled carbch steel strij) for general engineering purposes
{first r^ishh ),
^Specification for vvood particle boards ( medium density ) fbr general purposes.
♦♦Specification for veneered particle boards (^ri;r revision ).
ttSpecification for blockboards {s^tond revision )-
4:tSpecification for plywood for general pui-poses ( second revision ).

IS ; 3761 . 1983

3.2 Tolerances — The dimensions specified in 3.1 shall not vary by more
than + 5 mm.

4. FABRICATION

4.1 Components — Metal side racks shall be assembled from the following
components as given in 4.2 to 4.4.

4.2 Angle Posts — The length of angle posts shall correspond to height
of rack. The thickness of post when made from sheet shall be not less than
3-0 mm. Rolled steel angle posts shall be of 40x40x3 size. Angle posts
shall be free from twist, sharp edges and burrs.

4.2.1 Holes in Angle Posts — Angle posts shall have 8 mm diameter
holes provided at 50-mm centres.

4.3 Shelves — Shelves shall be made from mild steel sheets not less than
VO mm in thickness. Shelves shall have lipped flanges, width of flange being
30 mm and depth of lip 15 mm. The size of shelves shall be derived from
the dimensions of racks given in 3.1 and the thickness of angles and gussets
where used.

4.3.1 Hofes in Shelves — Shelves shall have 8 mm corresponding holes
for fixing them to angle posts. In addition, shelves shall have 8-mm holes
for corner gussets.

4.3.2 Wood based panel shelf is made from wood particle board or
veneered particle board, or blockboard or plywood not less than 20 mm
in thickness with four brackets fixed on the ends and sides near the corners
( see Fig. 1 ). The brackets shall be made of mild steel sheeting not less
than 1*6 mm thick and shall have 8-mm corresponding holes for fixing
them to the angle posts. The wood based panel shelf may have additional
8-mm holes and fixures, if required.

4.4 Gussets — Eight gussets, four on each face of the rack shall be fitted.
Gussets shall be made of TO mm minimum thick mild steel sheet and shall
be not less than 75 mm long at each end joining to the shelf and the angle
post.

5. ASSEMBLY

5.1 the various components shall be assembled by means of bolting.

6. FINISH

6.1 All dents, burrs and sharp edges sMll be removed from the various
components. The components shall be individually pickled, scrubbed and
rinsed to remove grease, rust, scale or any other foreign element.

K : 3761- 1983

20 mm THICK
WOOD BASED
PANEL SHELF

BRACKET

SECTION XX ; -

All dimensichns in fnillittiefres.

Fig. 1 AsRANdEMBm- mti Fixing of Wood Based panel Shelves

tS : 3761 . 1983

6.2 Immediately after pickling all the mild steel part^ shall be given
phosphating treatment conforming to Class C of IS : 3618-1966^. The
process for application of phosphate coating shall be in accordance with
IS : 6005-1970^

Note — Putty shall be applied to all the surfaces requiring filling and shall
conform to IS : 110-19683. Aluminium primer shall conform to IS : 5660-1970*.

6.3 Coat/coats of enamel paint shall then be applied as follows:

Finish coat with enamels conforming to IS : 151-1950^
IS : 2932-i974« or IS : 2933-1975^

6.3.1 The finish shall Idc smooth, uniformly applied and free from
visible defects. It shall not readily chip or flake. The dry film thickness
shall be not less than O'lO mm.

6.4 All other components shall be finished in colour as agreed to
between the purchaser and the supplier.

6.5 Wood Based Panel Components

6.5.1 Wood putty conforming to IS : 419-1967* shall be applied to
all wood based surfaces requiring filling, followed by a coat of suitable
primer paint, before the finishing coat ol paint is applied.

6.5.2 Wood based panels may be finished either with transparent gloss
french polish or stained dark and pohshed ( see also IS : 2338 ( Part 1 )
1967^

7. PERFORMANCE REQUIREMENTS OF FINISH

7.1 Scratch Hardness Test — A sample of mild steel plate 150 x 50 mm
in size and thickness 0'315 mm and finished as given in 6 shall be subjected
to scratch hardness test in accordance with 15.1 of IS : 101-1964^**. A
scratch showing the bare luetal shall not be produced on the test sample,

7.2 Pressure Test ~~ Samples prepared from mild steel plates of thickness
of 0'315 mm and finished as given in 6 shall be subjected to pressure test in
accordance with 15.2 of IS : 101-1964^". The metal surface shall not be
rendered visible when the test pieces are separated after the test.

iSpecification for phosphate treatment of iron and steel for protection against
corrosion.

2Code of practice for phosphating of iron and steel.

^•Specification for ready mixed paint, brushing, grey filler for enamels, for use over
primers ( first revision ),

^Specification for ready mixed paint, brushing, aluminium red oxide primer.

^Specification for ready mixed paint, spraying, finishing, stoving, enamel, for general
purposes, colour as required.

•Specification for enamel, synthetic, exterior (a) undercoating (b) finishing (first
revision ).

'Specification for enamel, exterior (a) undercoating (b) finishing {first revision ).

^Specification for putty for use on window frames (^r^r revision ).

«Code of practice for finishing of wood and wood based materials : Part 1 Operation
and workmanship.

lOMethods of test for ready mixed paints and enamels {second revision ).

7

7.3 Flexibility and Adiiesion Test — A sample of mild steel plate
150 X 50 mm in size and tliickness 0*315 mm and finished as given
in 6 shall be subjected to flexibility and adhesion test in accordance
with 16 of IS : 101-1964*. The paint film on the test piece shall not show
damage, detachment or cracking when examined under X 10 magnification.

7.4 Stripping Test — A sample of mild steel plate 150 X 50 mm in size
and thickness 0'3 15 mm and finished as given in 6 shall be subjected to
stripping test in accordance with 17 of IS : 101-1964*. The scratch
produced after the test shall be free from jagged edges.

7.5 Test for Protection Against Corrosion Under Conditions of Coiidenj$a-
tion — A mild steel panel of size 150 x 100 mm and thickness 1*25 mm and
finished as given in 6 shall be subjected to test for protection against
corrosion under conditions of condensation in accordance with 18 of
IS : 101-1964*. A metal surface shall show no signs of corrosion after the
test.

8. INFORMATION TO BE SUPPLIED BY THE PURCHASER

8.1 The purchaser shall supply the following information to the supplier
along with the order:

a) Colour and finish; and

b) Where alternate method of construction and finish are specified,
they shall be clearly stated in the order.

9. PACKING

9.1 All the component part^ shall be packed in such a way that no damage
is caused to them during transit.

10. MARKING

10.1 All steel racks shall be marked with a suitable mark identifying the
manufacturer.

10.1. 1 The steel racks may also be marked with the ISI Certification
Mark

Note — The use of the ISI Certification Mark is governed by the provisions of
the Indian Standards Institution ( Certification Marks ) Act and the Rules and
Regulations made thereunder. The ISI Mark on products covered by an Indian
Standard conveys the assurance that they have been produced to comply with the
requirements of that standard under a well-detined system of inspection, testing and
quality control which is devised and supervised by ISf and Operated by the
producer. ISI marked products are also continuously checked by ISI for conformity
to that standard as a further safeguard. Details of conditioas under which a licence
for the use of the ISI Certification Mark may be granted to manufacturers or
processors, may be obtained from the Indian Standards Institution.

♦Methods of test for ready mixed paints and enamels ( second revision ).